arc4random vs arc4random_uniform distribution in iOS

arc4random_test

    NSMutableArray *stats1 = [NSMutableArray arrayWithObjects:[NSNumber numberWithInteger:0], [NSNumber numberWithInteger:0], [NSNumber numberWithInteger:0], [NSNumber numberWithInteger:0], [NSNumber numberWithInteger:0], [NSNumber numberWithInteger:0], [NSNumber numberWithInteger:0], [NSNumber numberWithInteger:0], [NSNumber numberWithInteger:0], [NSNumber numberWithInteger:0], nil];
    NSMutableArray *stats2 = [NSMutableArray arrayWithObjects:[NSNumber numberWithInteger:0], [NSNumber numberWithInteger:0], [NSNumber numberWithInteger:0], [NSNumber numberWithInteger:0], [NSNumber numberWithInteger:0], [NSNumber numberWithInteger:0], [NSNumber numberWithInteger:0], [NSNumber numberWithInteger:0], [NSNumber numberWithInteger:0], [NSNumber numberWithInteger:0], nil];

    NSInteger nbSamples = 1000;
    for (NSInteger i = 0; i < nbSamples; i++) {
        NSInteger new = (arc4random() % 10);
        if (new >= 0 && new <= 9) {
            NSNumber *prev = [stats1 objectAtIndex:new];
            NSNumber *newNumber = [NSNumber numberWithInteger:[prev integerValue] + 1];
            [stats1 replaceObjectAtIndex:new withObject:newNumber];
        } else {
            ELog(@"ERROR");
        }
    }

    for (NSInteger i = 0; i < nbSamples; i++) {
        NSInteger new = arc4random_uniform(10);
        if (new >= 0 && new <= 9) {
            NSNumber *prev = [stats2 objectAtIndex:new];
            NSNumber *newNumber = [NSNumber numberWithInteger:[prev integerValue] + 1];
            [stats2 replaceObjectAtIndex:new withObject:newNumber];
        } else {
            ELog(@"ERROR");
        }
    }

    for (int i = 0 ; i < 10; i++) {
        DLog(@"Number %d: %@ - %@", i, [stats1 objectAtIndex:i], [stats2 objectAtIndex:i]);
    }